diff --git a/harshitjain/ConstructTreeFromTraversal.java b/harshitjain/ConstructTreeFromTraversal.java
new file mode 100644
index 0000000..fd78f86
--- /dev/null
+++ b/harshitjain/ConstructTreeFromTraversal.java
@@ -0,0 +1,29 @@
+package tree;
+
+public class ConstructTreeFromTraversal {
+
+	public static void main(String[] args) {
+		int preorder[] = {10,20,40,50,30,70,80,90};
+		int inorder[] = {40,20,50,10,30,80,70,90};
+		Node root = buildTree(preorder,inorder,0,7);
+		TreeTraversal.preorder(root);
+	}
+	static int preIndex = 0;
+	private static Node buildTree(int[] preorder, int[] inorder, int is, int ie) {
+		if(is>ie) return null;
+		Node root = new Node(preorder[preIndex++]);
+		int inIndex = 0;
+		for(int i = is; i <= ie; i++) {
+			if(inorder[i] == root.key) {
+				inIndex = i;
+				break;
+			}
+		}
+		root.left = buildTree(preorder,inorder,is,inIndex-1);
+		root.right = buildTree(preorder,inorder,inIndex+1,ie);
+		
+		return root;
+		
+	}
+
+}